Dental plugger



June 16, 19 53 J, D. MORRISON 2,641,836

DENTAL PLUGGER Filed Aug. 51, 1951 I I INVENTOR James 0. Morrison W BY ATTORNEY Patented June 16, 1953 UNITED STATES PATNT 2,641,836 FICE DENTAL PLUGGER James Douglas Morrison, Medicine Hat,

Alberta, Canada Application August 31, 1951, Serial No. 244,599

2 Claims.

This invention relates to a means for connecting a rubber working member to a metallic shank and has particular reference to a connection between the shank of a dental plugger and a yieldable working face.

these operations in some instances will require working faces of various shapes, the working face and shank are so constructed as to be readily attached or detached with a minimum of effort.

It is a further important object of the invention to provide a working head which may be readily attached or detached from the shank of the plugger for sterilizing purposes and otherwise.

This invention is best understood from a consideration of the following detailed description in connection with the accompanying drawing forming a part of this application,nevertheless, it must be borne in mind that the invention is not confined to the disclosure, but is susceptible of such changes and modifications as shall define no material departure from the salient features as expressed in the appended claims.

Inthe drawing: 7

Figure 1 is an enlarged side elevation of a conventional plugger, having the working head attached.

Figure 2 is an enlarged perspective View of the working head detached from the shank of the plugger.

Figure Z-A is a bottom plan view of the base of the shank.

- Figure 3 is a side elevation of a shank and working head in assembled relation. I

Figure 4 is a vertical section on the line 4-4 of Figure 3.

Figure 5 is an enlarged side elevation of the working head. I

Figure 6 is a modified form of the working head.

Figure '7 is a further modification of the working head, and

Figure 8 is a still further form of the working head.

For the purpose of illustration, all views of the drawing are greatly enlarged and referring to Figure 1, there is shown a conventional plugger III having a chuck head II for reciprocably mounting a shank l2 of a working head I3.

The shank I2 has an integral base Id of circular form as may be seen in Figure 2-A. Transversely and medially of the base M a circular groove I5 is formed and concentric therewith a groove IQ of lesser diameter is formed, terminating inwardly of the adjacent periphery of the base, while the groove l5 opens upon the periphery of the base forming a passage for a semicircular retainer member I! of a Working head I8. The head also has an elongated semi-circular member I9 which is complemental to the groove I 6. The working head I8 will be of circular form of the same diameter as the base It.

In the bottom of the groove I5, inwardly of the periphery of the base, there is a recessZIl which seats a nodule 2i formed on the upper face of the member I'I.

Obviously a single straight groove could be formed in the base It and in such event, a plain semi-circular retaining member 22, as shown in Figure 5 would be employed.

In Figure 6 a modified form of a retaining member 23 is shown in the shape of a truncated cone, and of course, the groove of the base would have a corresponding shape. In Figure 7 a substantially hexagon shaped retaining member 24 is shown, which likewise would require a similarly shaped groove.

The working head l8 may have any desired work engaging face 24 and in Figure 8, the face is shown as being convex.

In the several forms shown, it will be seen that the working head lfi'may be readily secured to the base It by merely aligning the retainer members with the groove or grooves of the base and exerting an inward pressure was to'align the working head upon the base in concentric relation thereto. Also, the working head may be readily removed from the base for'replacement purposes,'thus avoiding the need for replacing the entire instrument, and also heads of various shapes and contours may be interchanged to meet varying requirements.

The working head [8 has been formed of rubber, although resilient material such as polythene or synthetic rubber neoprene may be employed.

I claim:

1. A dental plugger comprising a base having a shank, said base having an inner transverse medial groove, a groove of greater diameter formed in said base and concentric with the first groove, said last named groove opening upon the periphery of the base, and a resilient working face having a retainer member of diameters corresponding to respective grooves.

2. A dental plugger comprising a base having a shank, said base having an inner transverse medial groove, a groove of greater diameter formed in said base and concentric with the first groove, said last named groove opening upon the periphery of the base, a resilient working face having a retainer member of diameters corresponding to respective grooves, a recess formed in the base wall of the last named groove and. said retainer member having a nodule complemental to said recess.

JAMES DOUGLAS MORRISON.

References Cited inthe file of this patent UNITED STATES PATENTS Number Name Date 532,721 Dennis Jan. 15, 1895 

